Expertise / Legacy Bridge
Modernize Legacy
System Without
Losing Business Rules
Legacy Bridge is the only modernization platform that mathematically proves every feature of your application is preserved before a single line is rewritten.
Trusted by enterprises modernizing 15+ year-old systems with zero rule loss.
DID YOU KNOW
The Numbers Behind Legacy Bridge
0+
Trust Score Threshold.
3-5Days
Free Assessment Turnaround.
0%+
Deterministic, Not Gen AI.
0%
Functional Parity, Verified.
THE PROBLEM
70% of Modernization Projects Fail.
Almost always for the same reason: requirements were guessed, not extracted from the source. The 1-2 people who hold the keys eventually leave - and the knowledge leaves with them.
Legacy systems consume 60-80% of IT budgets.
Maintenance alone. Growth and innovation compete for whatever is left. Meanwhile, $750B is spent every year worldwide just keeping these systems alive — before a single new feature gets built.
Legacy Bridge extracts that institutional knowledge into a mathematically verified PRD before it walks out the door.
How Legacy Bridge Modernizes Legacy Applications
See the platform map, verify, and modernize decades-old systems with confidence.
THE DIFFERENCE
Built by Automation. Backed by Engineers.
Built by Automation. Backed by Engineers. While every competitor runs almost entirely on Gen AI—creating hallucination risks on critical features—we offer a different legacy system upgrade path. Our deterministic workflow engine handles the structural work, ensuring AI-driven legacy application transformation is accurate.
Delivered automatically by the platform
Analyzes your complete legacy codebase documentation — every file, function, dependency- Maps how your system actually works, not how it was documented
- Extracts business logic and functionality directly from source
- Generates detailed Product Requirement Documents (PRDs)
- Verifies accuracy and logic consistency at every step
- Designs UI mockups aligned to your brand and design system
Engineered by our experts
- Specification review and sign-off on every document
- Human context for nuanced business rules
- Third-party integrations wired to your APIs
- Performance optimization and security hardening
- UAT, issue resolution, and go-live support
- Zero-loss data migration with full schema generation
The 20% isn't where automation falls short. It's where engineering accountability lives.
Every automated output is validated by our experts before it becomes a build input.
HOW IT WORKS
The 8-Step Modernization Factory
Nothing happens in a black box. Every stage of your VB6 migration is visible, documented, and client-approved before the next begins.
Parse
Map your entire legacy codebase into a technology-neutral representation.
Analyse
Dead code, ghost variables, edge cases, injection risks — surfaced systematically.
Generate PRD
Every rule, workflow, entity, and role in your system, described in plain business English.
Verify Fidelity
A software modernization trust score is calculated. Mathematical proof the PRD is complete. Nothing moves until the threshold is met.
Design System
Brand-aligned UI/UX system generated from your palette. Component library and HTML mockups.
Refine
AI-assisted review interface where you and our team refine the PRD through conversation.
Specify
Pick your target stack. Full API spec, data model, frontend spec, and coding standards generated.
Deliver
Production-ready application with a complete Document Vault. Optional Agent Review Protocol.
Parse
Map your entire legacy codebase into a technology-neutral representation.
Analyse
Dead code, ghost variables, edge cases, injection risks — surfaced systematically.
Generate PRD
Every rule, workflow, entity, and role in your system, described in plain business English.
Verify Fidelity
A software modernization trust score is calculated. Mathematical proof the PRD is complete. Nothing moves until the threshold is met.
Design System
Brand-aligned UI/UX system generated from your palette. Component library and HTML mockups.
Refine
AI-assisted review interface where you and our team refine the PRD through conversation.
Specify
Pick your target stack. Full API spec, data model, frontend spec, and coding standards generated.
Deliver
Production-ready application with a complete Document Vault. Optional Agent Review Protocol.
ENGAGEMENT OPTIONS
Three Ways to Engage
Proof before commitment. Full delivery. Or a blueprint your team builds from.
Discovery & Assessment
Low-risk entry. Trust Score and PRD — no rebuild commitment.
- Full UAST extraction and semantic analysis
- AI-generated PRD in plain English
- Trust Score with confidence breakdown
- Dead code and risk report
Most PopularFull Modernization
End-to-end, source code to production. All 8 steps with engineering oversight.
Everything in Discovery & Assessment- Atomic design system and brand mockups
- 11-document specification package
- Expert validation at every stage
- Deployment, migration, and go-live
Specification Package
Have your own dev team? We deliver the spec — you build from it.
- PRD, design system, and UX foundation
- API spec and full data model
- Frontend specification
- Agent Review Protocol for QA
See Your Codebase Through Legacy Bridge — Free.
Send us your Visual Basic VB6 source code. We run it through the platform at no cost and deliver a structured analysis report, your Trust Score, and a PRD extract within days. Proof of what we found before you commit to anything.
What You'll Receive
- Full UAST extraction and semantic analysis
- Dead code, ghost logic, and security risk report
- PRD extract — sample of every business rule we captured
- Trust Score with mathematical confidence breakdown
- Delivered within 3–5 business days
Send us a message
Frequently Asked Questions
A mathematical confidence rating from 0 to 100 quantifying how completely and accurately our PRD represents your original application. Calculated using three passes: bipartite matching for coverage, semantic embedding to detect hallucinations, and blind cosine similarity for authentic correspondence. No other modernization service offers anything equivalent — the industry standard is “trust us.”
Copilot and Cursor are optimized for greenfield development — they help you write code faster, but they don't help you understand legacy systems. Modernization isn't a codegen problem; it's a comprehension problem. Legacy Bridge parses your legacy codebase, extracts every business rule into a Universal Abstract Syntax Tree, and verifies that extraction mathematically — all with explainable, deterministic outputs.
Yes. VB6 migration often fails due to lost logic. Legacy Bridge extracts every function, subroutine, event handler, conditional branch, and database operation into a UAST before the rebuild begins. The PRD from that extraction is verified mathematically and approved by you before engineering starts. The workflow engine — not Gen AI — handles structural extraction, which means no hallucination, no missed rules.
The cost of VB6 modernization depends on the size and complexity of your application — number of modules, forms, Crystal Reports, and database tables. The free Discovery and Assessment package gives you a fixed-cost entry with no obligation. After that, you'll get a precise delivery estimate before committing to the rebuild.
You don't have to take our word for it. The PRD is written in plain business English so a business owner can verify it. You receive the Trust Score before we build anything. If something is missing, you raise it in the AI-assisted refinement interface and we generate a new version. Your approval before engineering begins is a contractual checkpoint.